Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| RE33108 | Method for preparing a printed circuit board | Katsukiyo Ishikawa, Mamoru Seio | 1989-11-07 |
| 4869995 | Positive type photosensitive resinous composition | Masamitsu Shirai, Masahiro Tsunooka, Makoto Tanaka, Katsukiyo Ishikawa | 1989-09-26 |